Thermomechanical model for NiTi-based shape memory alloys including R-phase and material anisotropy under multi-axial loadings

0381632 - ÚT 2013 RIV GB eng J - Článek v odborném periodiku
Sedlák, Petr - Frost, Miroslav - Benešová, Barbora - Zineb, T.B. - Šittner, Petr
Thermomechanical model for NiTi-based shape memory alloys including R-phase and material anisotropy under multi-axial loadings.
International Journal of Plasticity. Roč. 39, DEC 2012 (2012), s. 132-151. ISSN 0749-6419. E-ISSN 1879-2154
Grant CEP: GA ČR GAP108/10/1296; GA ČR GA106/09/1573; GA ČR(CZ) GA101/09/0702; GA ČR GAP107/12/0800
Výzkumný záměr: CEZ:AV0Z20760514; CEZ:AV0Z10100521
Klíčová slova: shape memory alloys * constitutive modeling * R-phase * non-proportional loading * dissipation function
Kód oboru RIV: BJ - Termodynamika; JJ - Ostatní materiály (FZU-D)
Impakt faktor: 4.356, rok: 2012
http://www.sciencedirect.com/science/article/pii/S0749641912001027

This work presents a thermomechanical model for polycrystalline NiTi-based shape memory alloys developed within the framework of continuum thermodynamics of irreversible processes. The model is capable of realistic simulations of several physical phenomena, involving transformation between austenite, R-phase and martensite and martensite reorientation, which may simultaneously occur under general thermomechanical loading. This is due to three key features of the model: a novel form of the dissipation function coupling martensite transformation and reorientation processes, inclusion of the material responses associated with the transformation between austenite and R-phase and implementation of the influence of material anisotropy. Based on a mathematically consistent formulation, the model was implemented into finite elements providing a numerical tool particularly useful for analysis of NiTi-based highly-textured components, which are of great industrial importance. To explore and demonstrate further features of the proposed model several numerical simulations were performed and compared with experimental results.
Trvalý link: http://hdl.handle.net/11104/0212055